Worksheet 3
Balance and complete the following half equations:
2e
2 H+ + _______
1. ______
→ H2
e
2. ______ Li+ + _______
→ Li
2e
3. ______ Ca2+ + _______
→ Ca
2e
2 Cl- → Cl2 + _______
4. ______
2 O2- → O2 + _______
5. ______
2e
2e
2
6. ______
Br- → Br2 + _______
e
7. ______ Al3+ + ______
→ Al
2e → Mg
8. ______ Mg2+ + ______
e
9. ______K+ + ______
→K
2
2e
10. _______
I- → I2 + ________
2e
2
11. ______
N3- → N2 + _______
e
12. ______ Na+ + _______
→ Na
2e
2
13. ______
F- → F2 + _______
4e
4 OH- →______
2 H2O + O2 + _______
14. ______
Complete the table below.
Aqueous solution
1
2
3
4
5
6
7
8
9
10
Magnesium chloride
Calcium hydroxide
Copper sulfate
Zinc bromide
Magnesium nitrate
Copper chloride
Copper nitrate
Lithium iodide
Potassium hydroxide
Iron(III) chloride
Product formed at the
positive anode
Mg, H
H, Ca
H, Cu
Zn, H
OH, Cl
2 OH,
Mg, H
Cu, H
Cu, H
Li, H
K, H
Fe, H
Product formed at the
negative cathode
SO4, OH
Br, OH
NO3, OH
Cl, OH
2 OH
Cl, OH
NO3, OH
I, OH